Structural Design Patterns In C#

Adapter PatternAdapting an interface into another according to client expectation.

  • Flyweight design pattern facilitates us when we need to create a lot of Objects of a class.
  • Proxies can be used to provide additional functionality and security or to simply improve performance by caching or pre-loading data.
  • But in case of facade pattern, subsystems are not aware of the existence of the facade.
  • If you want to learn more about the Bridge pattern, see a real-world code example, then check outthis article.
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This makes your code more flexible and easier to maintain. By contrast, the Flyweight pattern is typically used when there is a need to minimize memory usage by sharing data between objects. These patterns provide different ways of partitioning responsibility between objects, making the overall structure more flexible and easier to maintain. Design patterns provide detailed solutions that you can apply in real-world scenarios.

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Subsystem interfaces are not aware of Facade and they shouldn’t have any reference of the Facade interface. When we want to represent part-whole hierarchies of objects. In this article, I am going to give a brief introduction to Structural Design Patternin C#. Please read our previous article where we discussed the Creational Design Patterns in C# with examples. As part of this article, we are going to discuss the following three things.

It still exposes the full functionality of the system for the clients who may need it. In a nutshell, it just provides a layer to the complex interfaces of the sub-system which makes it easier to use. The Composite Pattern allows you to compose objects into a tree structure to represent the part-whole hierarchy. It means you can create a tree of objects that is made of different parts, but that can be treated as a whole one big thing. Composite lets clients treat individual objects and compositions of objects uniformly, that’s the intent of the Composite Pattern. Then we explain the “Composite” pattern that puts objects in an order with the tree structure and reaches this structure from a single interface.

The Facade pattern makes the system easier to use by providing the client with a clean and simple interface. The Facade design pattern can also decouple a client from acomplex legacy code. The Facade design pattern provides a simplified interface to a complex part of a system. The Facade pattern hides the complexity of the subsystem and exposes a simplified interface to the client. As a result, you don’t have to reinvent the wheel when encountering a common software design problem.

Structural Design Patterns

Composite and Decorator have similar structure diagrams, reflecting the fact that both rely on recursive composition to organize an open-ended number of objects. In Software Engineering, Structural Design Patterns are Design Patterns that ease the design by identifying a simple way to realize relationships between entities. This pattern helps you to extend your object responsibilities dynamically with less subclassing. Here, we have completed the seventh design pattern of our article ‘Structural Design Patterns In Java’. Here, we have completed the sixth design pattern of our article ‘Structural Design Patterns In Java’. Extending the base decorator functionality and modifying the component behavior accordingly.

Proxy Design Pattern

Object patterns help users to create new objects by combining existing objects so that the objects gain properties. In conclusion, structural design patterns are critical in Object Oriented programming. The Flyweight design pattern is a software engineering design pattern that can improve software performance by reducing the amount of data that needs to be stored in memory. This pattern does it by sharing common data between objects rather than storing duplicate copies of the same data. This reduces memory usage, especially in applications where there is a large number of objects.

The proxy pattern is a pattern that involves the creation of objects that act as substitutes or stand-ins for other objects. Proxies can be used to provide additional functionality and security or to simply improve performance by caching or pre-loading data. The Proxy pattern is also sometimes known as the Surrogate pattern. BridgeA bridge method is a structural design pattern that permits us to separate big classes into two separate classes , and the implementation can be improved autonomously.

Structural Design Patterns

For example, we can have concrete decorator classes like NuttyIcecreamDecorator & HoneyIcecreamDecorator as below. Here, we have completed the fifth design pattern of our article ‘Structural Design Patterns In Java’. We create a bridge that coordinates between abstraction and implementation. Here, we have completed the fourth design pattern of our article ‘Structural Design Patterns In Java’.

Bridge Pattern

Structural design patterns are concerned with how classes and objects are organized to perform the desired functionality. FacadeThe facade is a structural design pattern that provides us with an uncomplicated interface to a framework, a library, or any other complex set of classes. Finally, we have discussed the problems that are solved by structural design patterns and why it is efficient in building application. The structural design patterns simplifies the structure by identifying the relationships. Flyweight pattern is basically used to reduce the number of objects created and used in the application.

Structural Design Patterns

They are particularly useful when you are taking advantage ofpolymorphism and need to choose between different classes at runtime rather than compile time. The Template Method is the simpler and more common of the two. A template method is an abstract definition of an algorithm. Each step invokes either an abstract operation or a primitive operation. A subclass fleshes out the algorithm by defining the abstract operations. In real-time applications, sometimes we need to change the structure of a class or the relationship among the classes but we don’t want this change to be affected by the project.

This pattern is particularly useful for making independently developed class libraries work together. Structural patterns are concerned with how classes and objects are composed to form larger structures. Behavioral patterns describe interactions between objects and focus on how objects communicate with each other.

Structural Design Patterns In C#

Decorator Lets you attach new behaviors to objects by placing these objects inside special wrapper objects that contain the behaviors. Facade Provides a simplified interface to a library, a framework, or any other complex set of classes. Flyweight Lets you fit more objects into the available amount of RAM by sharing common parts of state between multiple objects instead of keeping all of the data in each object.

The children of a composite can be leaves or other composites. Design Pattern solutions are independent of any programming language and platform and represent an idea to solve a common problem. If you are new to design patterns, I would highly recommend you to read the “Introduction to Design Patterns” article. Structural class patterns use inheritance to compose interfaces or implementations. As a simple example, consider how multiple inheritance mixes two or more classes into one. The result is a class that combines the properties of its parent classes.

The adapter connects the two objects, providing an interface that converts one type of object into another. In Facade Pattern, we provide a simplified interface to a set of interfaces of a subsystem for hiding its complexity of subsystem from the client. In simple words with the help of facade pattern, we make sub-systems easier to use by describing a higher-level interface. The focal points for Structural design patterns lie in creating new structures without destroying the old ones. On top of that, the standard of loose coupling for reuse and change are both maintained and enhanced in the Structural patterns. However, the Facade does not encapsulate the subsystem classes or interfaces; it just provides a simplified interface to their functionality.

Structural Design Patterns

In the Proxy Design Pattern, a client does not directly talk to the original object, it delegates calls to the proxy object which calls the methods of the original object. Moreover, the important point is that the client does not know about the proxy. But there are many variations to this approach which we will see shortly. Here, we have completed the second design pattern of our article ‘Structural Design Patterns In Java’. You want to create a reusable class that co-operates with unrelated or unforeseen classes, that is, classes that don’t necessarily have compatible interfaces. Here, we have completed the first design pattern of our article ‘Structural Design Patterns In Java’.


They can reduce complex flow charts to mere interconnections between objects of various classes. Behavioral patterns are also used to make the algorithm that a class uses simply another parameter that is adjustable at runtime. Behavioral patterns are concerned with algorithms and the assignment of responsibilities between objects. Behavioral patterns describe not just patterns of objects or classes but also the patterns of communication between them. These patterns characterize complex control flow that is difficult to follow at run-time. They shift your focus away from the flow of control to let you concentrate just on the way objects are interconnected.


Protection proxy- It is helpful when the objects have different access rights. Remote proxy – It basically provides a local representation for an object in a different address space. There are many dependencies between clients and implementation class of an abstraction. Mainly target of using this pattern is to save your memory by using shared objects. This pattern separates interface or abstraction from its implementation, so for example you may be using two different technologies in two implementations. Should be used when we have a need to switch implementation at runtime.

What are Structural Design Patterns stand for?

In software engineering, structural design patterns are design patterns that ease the design by identifying a simple way to realize relationships among entities. A structural design pattern is a category of Design patterns that provides new functionality while preserving these structures flexible and efficient. It also combines different classes and objects to form more extensive networks and provide new functionality while keeping these structures adaptable and useful. As the word adapter suggests, Adapter design patternis one of thestructural design patterns that makes two unrelated interfaces work together.

Behavioral patterns

This pattern gathers all interfaces or complex systems of classes or frameworks or etc, and makes using them simple for you. The Flyweight Pattern is designed to control such kind of object creation and provides you with a basic caching mechanism. It allows you to create one object per type , and if you ask for an object with the same property , it will return you the same object instead of creating a new one. Sometimes the objects in an application might have great similarities and be of a similar kind . In case they are also heavy objects to create, the application developer should control them. Otherwise, they might consume much of the memory and eventually slow down the whole application.

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